{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Chemical"], "input": "The cardioprotective properties of erythropoietin ( EPO ) in pre - clinical studies are well documented , but erythropoietic and prothrombotic properties of EPO preclude its use in chronic heart failure ( CHF ) ."}
{"Chemical": []}